116 lines
3.7 KiB
Ruby
Executable File
116 lines
3.7 KiB
Ruby
Executable File
#!/usr/bin/env ruby
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#
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# Copyright (C) 2013 Red Hat, GmbH
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#
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# This file is released under the GPL
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#
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#
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# Script to calculate device-mapper thin privisioning
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# metadata device size based on pool, block size and
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# maximum expected thin provisioned devices and snapshots.
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#
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require 'optparse'
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require 'pathname'
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#----------------------------------------------------------------
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$prg = Pathname.new($0).basename
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def init_units
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units = {}
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units[:bytes_per_sector] = 512
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units[:chars] = "bskKmMgGtTpPeEzZyY"
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units[:strings] = [ 'bytes', 'sectors',
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'kilobytes', 'kibibytes', 'megabytes', 'mebibytes',
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'gigabytes', 'gibibytes', 'terabytes', 'tebibytes',
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'petabytes', 'pebibytes', 'exabytes', 'ebibytes',
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'zetabytes', 'zebibytes', 'yottabytes', 'yobibytes' ]
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units[:factors] = [ 1, units[:bytes_per_sector] ]
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1.step(8) { |e| units[:factors] += [ 1024**e, 1000**e ] }
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units
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end
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def get_index(unit_char, units)
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unit_char ? units[:chars].index(unit_char) : 1
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end
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def check_opts(opts)
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abort "#{$prg} - 3 arguments required!" if opts.length < 3
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abort "#{$prg} - block size must be > 0" if opts[:blocksize] <= 0
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abort "#{$prg} - poolsize must be much larger than blocksize" if opts[:poolsize] < opts[:blocksize]
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abort "#{$prg} - maximum number of thin provisioned devices must be > 0" if opts[:maxthins].nil? || opts[:maxthins] == 0
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end
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def to_bytes(size, units)
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a = size.split(/[#{units[:chars]}]/)
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s = size.to_i.to_s
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abort "#{$prg} - only one unit character allowed!" if a.length > 1 || size.length - s.length > 1
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abort "#{$prg} - invalid unit specifier!" if s != a[0]
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size.to_i * units[:factors][get_index(size[a[0].length], units)]
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end
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def parse_command_line(argv, units)
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opts = {}
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os = OptionParser.new do |o|
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o.banner = "Thin Provisioning Metadata Device Size Calculator.\nUsage: #{$prg} [opts]"
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o.on("-b", "--block-size BLOCKSIZE[#{units[:chars]}]", String,
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"Block size of thin provisioned devices.") do |bs|
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opts[:blocksize] = to_bytes(bs, units)
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end
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o.on("-s", "--pool-size SIZE[#{units[:chars]}]", String, "Size of pool device.") do |ps|
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opts[:poolsize] = to_bytes(ps, units)
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end
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o.on("-m", "--max-thins #MAXTHINS", Integer, "Maximum sum of all thin devices and snapshots.") do |mt|
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opts[:maxthins] = mt
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end
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o.on("-u", "--unit [#{units[:chars]}]", String, "Output unit specifier.") do |u|
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abort "#{$prg} - output unit specifier invalid." if u.length > 1 || !(u =~ /[#{units[:chars]}]/)
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opts[:units] = u
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end
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o.on("-n", "--numeric-only", "Output numeric value only.") do
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opts[:numeric] = true
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end
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o.on("-h", "--help", "Output this help.") do
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puts o
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exit
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end
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end
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begin
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os.parse!(argv)
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rescue OptionParser::ParseError => e
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abort "#{$prg} #{e}\n#{$prg} #{os}"
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end
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check_opts(opts)
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opts
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end
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def mappings_per_block
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btree_nodesize, btree_node_headersize, btree_entrysize = 4096, 64, 16
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(btree_nodesize - btree_node_headersize) / btree_entrysize
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end
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def estimated_result(opts, units)
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idx = get_index(opts[:units], units)
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# double-fold # of nodes, because they aren't fully populated in average
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r = (1.0 + (2 * opts[:poolsize] / opts[:blocksize] / mappings_per_block + opts[:maxthins])) * 8 * units[:bytes_per_sector] # in bytes!
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r /= units[:factors][idx] # in requested unit
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tmp = "%.2f" % r
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if tmp.to_f > 0.0
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r = tmp.to_i.to_f == tmp.to_f ? tmp.to_i : tmp
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else
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r = "%.2e" % r
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end
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r = "#{$prg} - estimated metadata area size is #{r} #{units[:strings][idx]}." if !opts[:numeric]
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r
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end
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#----------------------------------------------------------------
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# Main
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#
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puts estimated_result(parse_command_line(ARGV, (units = init_units)), units)
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